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A proton and a deutron moving with equal...

A proton and a deutron moving with equal kinetic energies enter perpendicularly into a magnetic field. If `r_p` and `r_d` are the respective radii of the circular path, then the ratio `r_p//r_d` is

A

1

B

`sqrt2//1`

C

`1//sqrt2`

D

`1//2`.

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